Question: Balancing backsight and foresight distances will eliminate what source ( s ) of error? A: The instrument's line of sight is not horizontal when the

Balancing backsight and foresight distances will eliminate what source(s) of
error?
A: The instrument's line of sight is not horizontal when the bubble is level
B: Curvature and refraction
C : The horizontal hair is not perpendicular to the vertical hair.
D: A & B
Balancing backsight and foresight distances will

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